Edge-turning device for blades.



A. L. BLODGETT.

EDGE TURNING DEVICE FOR BLADES.

APPLICATION-FILED APR. 23, 1910.

990,53 1 8. v Pa ent d Apr. 25, 1911.

ATENT 0FFIE ALANDO L. .BLODGETT, OF SOUTH BEND, INDIANA.

EDGE-TURNING DEVICE FOR BLADES.

T 0 all whom it may concern:

Be it known that I, ALANDo L. Bnonon'rr, a citizen of the United States,residing at South Bend, in the county of St. Joseph and State ofIndiana, have invented. certain new and useful Improvements inEdge-Turning Devices for Blades, of which the following is aspecification.

My invention relates to improvements in means for turning the edge ofblades, more particularly scraper blades, such as are used in connectionwith floor dressing machines, or which are manipulated without the useof a machine.

The object of the present invention is to provide an edge turning devicewhich is simple of construction, easy of operation and efficient for thepurpose designed.

A further object of the invention resides in the provision of meanswhereby an edge may be uniformly turned upon a blade having a curvededge.

With these and other objects, the invention consists in certain novelfeatures of construction as hereinafter described and specificallypointed out in the claims.

In the drawings employed for illustrating the preferred embodiment ofthe invention:Figure 1 is a side elevation of the edge turning device.Fig. 2 is a top or plan view thereof. Fig. 3 is an end view. Fig. 4 isan end view of the blade holder, partly in section, with a bladetherein, and the edge turning roller. Fig. 5 is a fragmentary viewshowing a lever for depressing one end of the edge turning roller.

Referring now more particularly to the accompanying drawing, thereference character 5 indicates an elongated base, preferably of metal,which has two oppositely disposed standards 6 mounted thereon, saidstandards comprising reduced portions 7 which extend along the edge ofthe base for a considerable distance, in order to form guides for theblade holding carriage 8, disposed to rest and slide upon the basebetween said members.

The carriage 8 is provided with a blade holder consisting of a fixedmember 9, which may be formed integral with the carriage or suitablymounted thereon, and a vertically adjustable member 10, substantially Lshaped in cross section, as shown in Fig. 4. The ends of the adjustablemember 10, are held in position with relation to the fixed member bylateral extensions on the latter Specification of Letters Patent.

Application filed. April 23, 1910.

Patented Apr. 25, 1911.

Serial No. 557,286.

forming guides '11, into which the ends of the adjustable member fit soas to permit vertical adjustment of said member. The

adjustment is accomplished by means of threaded bolts 12, which engagethreaded apertures in the lugs 13, 14, on the adjustable member, theneck of the lug 13 extending through a slot in the fixed member 9 (notshown), and the lower ends of the bolts resting upon the carriage. TheL-shaped formation of the adjustable member in cross-section, and theend of its horizontal arm resting against the fixed member, forms apocket for the reception of the blade to be operated upon, and theadjustability of this member permits blades of varying sizes to beproperly held thereby. The blade holder is disposed at an angle withrelation to the side edges of the carriage and with the direction oftravel thereof, for a purpose presently explained.

The carriage 8 is formed with a rack 15 on its upper side and along oneedge thereof, a gear 16, suitably journaled upon a stud shaft 17,meshing with said rack. A pinion 18 mounted upon a shaft 19, journaledin the uprights 6, in turn meshes with the gear 10, and upon turning thecrank handle 20 upon the end of shaft 19, the carriage 8 may bepropelled in either direction.

Mounted upon the shaft 19, is a concaved edge turning roller 22, which,upon operation of the crank handle, is rotated in a direction oppositeto the travel of the carriage, and a blade edge disposed in the holderon the carriage so that its edge Will contact with the roller, isopposed in its movement by the opposite movement of the roller, and asthe blade is disposed at an angle to the roller, the edge thereof iscaused to yield and is turned to one side, as plainly shown in Fig. 4.The shaft 19 is loosely journaled at one end, by passing the samethrough a vertical slot 28, in the standard, so that by applyingpressure to the end of the lever 24, fulcrumed at 25, and which restsupon the shaft, the operator may vary the size of the turn to be madeupon the blade edge.

In order to obtain the highest degree of efficiency in blades employedfor scraping purposes, experience has demonstrated that the blade shouldbe turned at its edge at a particular angle, and that the edge shouldhave a longitudinal convex formation as well. In order that a uniformturn or bend caused to yield and turn to one side.

may be made on a blade having such a formation, I use the concave edgeturning roller, which compensates for the curvature of the convex bladeedge as the latter travels at an angle thereto, thereby bringing thelowest points of the blade edge at either end into contact with thelarger ends of the roller, and the center or highest point of the bladeedge into contact with the center or smaller diameter of the roller.

In practice a scraper blade is positioned in the holder on the carriageso that its up per edge will, upon movement of the carriage, contactwith the edge turning roller, the height of the blade depending upon thedegree of the turn desired. The crank handle is next operated, whichcauses the carriage to travel and bring the blade edge into contact withthe roller at an angle thereto. As the roller rotates in an oppositedirection to the travel of the blade, the latters movement is opposedand the edge The degree of the turn to be given the edge may be variedsomewhat by manipulation of the lever to depress the roller shaft, asheretofore explained.

IVhat is claimed is 1. In an edge turning device for blades, thecombination of means for feeding the blade longitudinally anddiagonally, of

means for contacting with the blade edge to resist its movement andcause the edge to yield and turn.

2. In an edge turning device for blades, the combination of a travelingmember embodying means for holding a blade diagonally thereon, of arotary member for conrections.

tacting with the blade edge, and means for feeding the traveling bladeholder and operating the rotary member in opposite di- 3. In an edgeturning device for blades, the combmation of a traveling memberembodying means for holding a blade diagonally thereon, of an edgeturning member mounted on a shaft, power transmitting means connectingthe shaft and blade holder, and means for operating the shaft.

4. In an edge turning device for blades, the combination of a travelingmember, a rotary concaved edge turning member, a blade holder diagonallymounted on the traveling member to present the blade edge for contactwith the edge turning member at an angle thereto, and means foroperating the traveling member.

5. In an edge turning device for blades,

the combination of a traveling blade holderdisposed at an angle to itsdirection of movement, of an edge turning roller having a concavedperiphery, and means for operating the blade holder and roller.

6. In an edge turning device for blades, the combination of a travelingmember, of a blade holder diagonally mounted thereon, having laterallyextending ears, adjusting screws engaging screw threaded apertures insaid ears, an edge turning member for contacting with the blade edge,and means for operating the traveling member.

7. In an edge turning device for blades, the combination of a base, of ablade holder arranged to slide thereon and having a rack alongone edge,oppositely disposed uprights on the base, a gear mounted upon a shaftsupported by one of said uprights and meshing with said rack, a shaftjournaled in the uprights, a pinion mounted on said shaft and meshingwith said gear, an edge turning roller mounted on the shaft, and meansfor rotating the shaft.

In testimony whereof I ailix my signature, in presence of two witnesses.

ALANDO L. BLODGETT' IVitnesses GRACE M. COLE, LULU D. VVAHLEN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

